在网络上，大多数(但不是所有)的原版剧本都可以找到，但由于各种原因，英文版的却廖廖无几。
Most (but not all) librettos are available on the Web in the original language, but for a variety of reasons English translations are rarely offered.
然而，由于他们都未能找到决定历史进程的“首要因素”或“普遍原因”，终究未能实现探求规律的抱负。
However, because of their failures to discover the principal factor or universal cause, they could not realize their aspiration.
由于这个原因，大量的研究工作都在致力于寻找到新型的抗菌产品。
For these reasons, a great deal of research is focused on finding new antibiotic compounds.
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